With all the developments in DSLR and mirrorless camera technology, it seems that superzooms like the HS50 EXR just aren't as popular anymore. Perhaps not even popular enough to justify the extensive process of writing a review. If you look at the latest three reviews posted on the site, and take the number of times it's been shared as an indicator of interest in the camera (I can't access any site statistics, so it will have to do), here's what you find:

Now compare that with the Fuji HS30 EXR review posted in September of last year (2012, which means it has had a lot more time to get shared around): 2x Twitter, 6x Facebook, and 19x Google+ (28 shares total).

Writing a review takes a lot of time and effort, so you have to consider carefully whether completing it is worth that time and effort. For that reason, I am not surprised that reviews for the camera are either delayed or, more probably, not to be posted at all.